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verticillaster

noun
ver·​ti·​cil·​las·​ter | \ˌvərtəsə̇ˈlastə(r)\
plural -s

Definition of verticillaster 

: a mixed inflorescence (as in many labiates) consisting of a pair of much-condensed nearly sessile cymes arranged around an axis like a true verticil

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History and Etymology for verticillaster

New Latin, from verticill- + -aster

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